Description: Size and Shape: rounded tube with 12mm outside diameter, 10mm inner diameter, 500mm overall length. Lightweight: strong as metal but only one fifth in weight, corrosion-resistant and heat-resisting. Smooth Surface: made of high tensile carbon fiber, matte surface. Application: carbon fiber wing tube is used for racing drones, RC helicopter wing, RC airplanes and RC sailboats, kite spars. Features:Tube Shape: Circular PipeOutside Diameter: 12mmInner Diameter: 10mmOverall Length: 500mm Package Content:1 x Carbon Fiber Tube